18885498441265 has 4 divisors (see below), whose sum is σ = 22662598129524. Its totient is φ = 15108398753008.

The previous prime is 18885498441259. The next prime is 18885498441269. The reversal of 18885498441265 is 56214489458881.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11767012974864 + 7118485466401 = 3430308^2 + 2668049^2 .

It is a cyclic number.

It is not a de Polignac number, because 18885498441265 - 2¹¹ = 18885498439217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18885498441269) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1888549844122 + ... + 1888549844131.

It is an arithmetic number, because the mean of its divisors is an integer number (5665649532381).

Almost surely, 2^{18885498441265} is an apocalyptic number.

It is an amenable number.

18885498441265 is a deficient number, since it is larger than the sum of its proper divisors (3777099688259).

18885498441265 is an equidigital number, since it uses as much as digits as its factorization.

18885498441265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3777099688258.

The product of its digits is 707788800, while the sum is 73.

The spelling of 18885498441265 in words is "eighteen trillion, eight hundred eighty-five billion, four hundred ninety-eight million, four hundred forty-one thousand, two hundred sixty-five".